Norton 66253019362 Surface Grinding Wheel 8in 46 Grit Type 5

Product Description

The NORTON 66253019362 is a Type 5 ceramic surface grinding wheel engineered for aggressive stock removal on hard ferrous metals and specialty alloys. Built around a vitrified bond and semi-friable ceramic abrasive grain, this wheel continuously fractures to expose fresh cutting edges, reducing heat buildup and wheel loading. It measures 8 inches in diameter by 1 inch thick with a 1-1/4 inch arbor hole and a one-side recess 3-1/4 inches in diameter and 1/2 inch deep. The 46 grit, H hardness rating places it in the coarse-cut, soft-to-medium hardness range — well suited to precision surface and cylindrical grinding applications where a cool, free-cutting action is required.

This wheel is rated for wet grinding operations and is designed for use on surface grinders and cylindrical grinders in production and maintenance shop environments. Material applications include 400 Series stainless steel, hard carbon steels, tool steels, titanium, super alloys, cast iron, ductile iron, and gray iron. The 3SG Type 5 series designation identifies the Norton SG seeded-gel ceramic grain technology behind this wheel. It is appropriate for both commercial machine shops and industrial maintenance facilities where consistent surface finish and dimensional accuracy are required on difficult-to-grind materials.

Key Features

• Ceramic abrasive grain with semi-friable fracture characteristics for consistent, cool cutting action
• Vitrified bond provides rigidity and porosity for efficient coolant flow during wet grinding
• Type 5 recessed geometry (3-1/4 inch recess diameter, 1/2 inch recess depth) clears flanges on standard spindle setups
• 46 grit coarse grade for high material removal rates on hard ferrous and exotic alloy workpieces
• H hardness code indicates a soft wheel grade that releases dull grains quickly, minimizing heat and glazing
• Rated to 3600 RPM for safe operation on surface and cylindrical grinding equipment

Compatibility

Designed for use with surface grinders and cylindrical grinders. Compatible material applications include 400 Series stainless steel, hard carbon steels, tool steels, titanium, super alloys, cast iron, ductile iron, and gray iron. Fits spindles accepting a 1-1/4 inch arbor hole with a Type 5 one-side recessed wheel configuration.

Installation Notes

Grinding wheel mounting should be performed by a qualified machine operator or toolroom technician following ANSI B11.9 and OSHA 29 CFR 1910.215 safety standards. Always ring-test the wheel for cracks before mounting and confirm the machine spindle speed does not exceed the 3600 RPM maximum rating stamped on the wheel. Power down and lock out the grinder before changing wheels. Use proper reducing bushings and flange hardware rated for the arbor size — never force-fit a wheel onto an oversized spindle.